Where are they?
And why haven't we found them yet?
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Three possibilities. And we don’t have a clue which (if any) is correct. No wonder the search for life on other planets and speculation about what it would be like has so many in its grip! We’ve been looking, and looking, and looking – and we haven’t found a trace.
Does that mean there’s nothing there? Or does it mean that we’re not looking in the right way, or the right place, or we don’t yet have the technology for effective search? If life – intelligent life – exists elsewhere, where is it? Why have we not found it, and why has it not found us?
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